Commit | Line | Data |
---|---|---|
b07e6aa3 | 1 | /* $Cambridge: exim/src/src/spam.c,v 1.11 2005/08/01 14:41:25 ph10 Exp $ */ |
8523533c TK |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */ | |
8 | /* License: GPL */ | |
9 | ||
10 | /* Code for calling spamassassin's spamd. Called from acl.c. */ | |
11 | ||
12 | #include "exim.h" | |
13 | #ifdef WITH_CONTENT_SCAN | |
14 | #include "spam.h" | |
15 | ||
16 | uschar spam_score_buffer[16]; | |
17 | uschar spam_score_int_buffer[16]; | |
18 | uschar spam_bar_buffer[128]; | |
19 | uschar spam_report_buffer[32600]; | |
20 | uschar prev_user_name[128] = ""; | |
21 | int spam_ok = 0; | |
22 | int spam_rc = 0; | |
23 | ||
24 | int spam(uschar **listptr) { | |
25 | int sep = 0; | |
26 | uschar *list = *listptr; | |
27 | uschar *user_name; | |
28 | uschar user_name_buffer[128]; | |
f7b63901 | 29 | unsigned long mbox_size; |
8523533c TK |
30 | FILE *mbox_file; |
31 | int spamd_sock; | |
32 | uschar spamd_buffer[32600]; | |
cfe75fc3 | 33 | int i, j, offset, result; |
8523533c TK |
34 | uschar spamd_version[8]; |
35 | uschar spamd_score_char; | |
36 | double spamd_threshold, spamd_score; | |
37 | int spamd_report_offset; | |
38 | uschar *p,*q; | |
39 | int override = 0; | |
cfe75fc3 PH |
40 | time_t start; |
41 | size_t read, wrote; | |
8523533c | 42 | struct sockaddr_un server; |
f452e07e | 43 | #ifndef NO_POLL_H |
cfe75fc3 | 44 | struct pollfd pollfd; |
f452e07e | 45 | #endif |
8523533c | 46 | |
5614ee86 TK |
47 | /* stop compiler warning */ |
48 | result = result; | |
49 | ||
8523533c TK |
50 | /* find the username from the option list */ |
51 | if ((user_name = string_nextinlist(&list, &sep, | |
52 | user_name_buffer, | |
53 | sizeof(user_name_buffer))) == NULL) { | |
54 | /* no username given, this means no scanning should be done */ | |
55 | return FAIL; | |
56 | }; | |
57 | ||
58 | /* if username is "0" or "false", do not scan */ | |
59 | if ( (Ustrcmp(user_name,"0") == 0) || | |
60 | (strcmpic(user_name,US"false") == 0) ) { | |
61 | return FAIL; | |
62 | }; | |
63 | ||
64 | /* if there is an additional option, check if it is "true" */ | |
65 | if (strcmpic(list,US"true") == 0) { | |
66 | /* in that case, always return true later */ | |
67 | override = 1; | |
68 | }; | |
69 | ||
8e669ac1 | 70 | /* if we scanned for this username last time, just return */ |
8523533c TK |
71 | if ( spam_ok && ( Ustrcmp(prev_user_name, user_name) == 0 ) ) { |
72 | if (override) | |
73 | return OK; | |
74 | else | |
75 | return spam_rc; | |
76 | }; | |
8e669ac1 | 77 | |
8523533c TK |
78 | /* make sure the eml mbox file is spooled up */ |
79 | mbox_file = spool_mbox(&mbox_size); | |
8e669ac1 | 80 | |
8523533c TK |
81 | if (mbox_file == NULL) { |
82 | /* error while spooling */ | |
83 | log_write(0, LOG_MAIN|LOG_PANIC, | |
84 | "spam acl condition: error while creating mbox spool file"); | |
85 | return DEFER; | |
86 | }; | |
87 | ||
cfe75fc3 | 88 | start = time(NULL); |
8523533c TK |
89 | /* socket does not start with '/' -> network socket */ |
90 | if (*spamd_address != '/') { | |
91 | time_t now = time(NULL); | |
92 | int num_servers = 0; | |
93 | int current_server = 0; | |
94 | int start_server = 0; | |
95 | uschar *address = NULL; | |
96 | uschar *spamd_address_list_ptr = spamd_address; | |
97 | uschar address_buffer[256]; | |
98 | spamd_address_container * spamd_address_vector[32]; | |
99 | ||
100 | /* Check how many spamd servers we have | |
101 | and register their addresses */ | |
102 | while ((address = string_nextinlist(&spamd_address_list_ptr, &sep, | |
103 | address_buffer, | |
104 | sizeof(address_buffer))) != NULL) { | |
8e669ac1 | 105 | |
8523533c TK |
106 | spamd_address_container *this_spamd = |
107 | (spamd_address_container *)store_get(sizeof(spamd_address_container)); | |
8e669ac1 | 108 | |
8523533c TK |
109 | /* grok spamd address and port */ |
110 | if( sscanf(CS address, "%s %u", this_spamd->tcp_addr, &(this_spamd->tcp_port)) != 2 ) { | |
111 | log_write(0, LOG_MAIN, | |
112 | "spam acl condition: warning - invalid spamd address: '%s'", address); | |
113 | continue; | |
114 | }; | |
8e669ac1 | 115 | |
8523533c TK |
116 | spamd_address_vector[num_servers] = this_spamd; |
117 | num_servers++; | |
118 | if (num_servers > 31) | |
119 | break; | |
120 | }; | |
8e669ac1 | 121 | |
8523533c TK |
122 | /* check if we have at least one server */ |
123 | if (!num_servers) { | |
124 | log_write(0, LOG_MAIN|LOG_PANIC, | |
125 | "spam acl condition: no useable spamd server addresses in spamd_address configuration option."); | |
f1e894f3 | 126 | (void)fclose(mbox_file); |
8523533c TK |
127 | return DEFER; |
128 | }; | |
129 | ||
130 | current_server = start_server = (int)now % num_servers; | |
131 | ||
132 | while (1) { | |
8e669ac1 | 133 | |
8523533c TK |
134 | debug_printf("trying server %s, port %u\n", |
135 | spamd_address_vector[current_server]->tcp_addr, | |
136 | spamd_address_vector[current_server]->tcp_port); | |
8e669ac1 | 137 | |
8523533c TK |
138 | /* contact a spamd */ |
139 | if ( (spamd_sock = ip_socket(SOCK_STREAM, AF_INET)) < 0) { | |
140 | log_write(0, LOG_MAIN|LOG_PANIC, | |
141 | "spam acl condition: error creating IP socket for spamd"); | |
f1e894f3 | 142 | (void)fclose(mbox_file); |
8e669ac1 | 143 | return DEFER; |
8523533c | 144 | }; |
8e669ac1 | 145 | |
8523533c TK |
146 | if (ip_connect( spamd_sock, |
147 | AF_INET, | |
148 | spamd_address_vector[current_server]->tcp_addr, | |
149 | spamd_address_vector[current_server]->tcp_port, | |
150 | 5 ) > -1) { | |
151 | /* connection OK */ | |
152 | break; | |
153 | }; | |
8e669ac1 | 154 | |
8523533c TK |
155 | log_write(0, LOG_MAIN|LOG_PANIC, |
156 | "spam acl condition: warning - spamd connection to %s, port %u failed: %s", | |
157 | spamd_address_vector[current_server]->tcp_addr, | |
158 | spamd_address_vector[current_server]->tcp_port, | |
159 | strerror(errno)); | |
160 | current_server++; | |
161 | if (current_server >= num_servers) | |
162 | current_server = 0; | |
163 | if (current_server == start_server) { | |
164 | log_write(0, LOG_MAIN|LOG_PANIC, "spam acl condition: all spamd servers failed"); | |
f1e894f3 PH |
165 | (void)fclose(mbox_file); |
166 | (void)close(spamd_sock); | |
8523533c TK |
167 | return DEFER; |
168 | }; | |
169 | }; | |
170 | ||
171 | } | |
172 | else { | |
173 | /* open the local socket */ | |
174 | ||
175 | if ((spamd_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
176 | log_write(0, LOG_MAIN|LOG_PANIC, | |
177 | "malware acl condition: spamd: unable to acquire socket (%s)", | |
178 | strerror(errno)); | |
f1e894f3 | 179 | (void)fclose(mbox_file); |
8523533c TK |
180 | return DEFER; |
181 | } | |
182 | ||
183 | server.sun_family = AF_UNIX; | |
184 | Ustrcpy(server.sun_path, spamd_address); | |
185 | ||
186 | if (connect(spamd_sock, (struct sockaddr *) &server, sizeof(struct sockaddr_un)) < 0) { | |
187 | log_write(0, LOG_MAIN|LOG_PANIC, | |
188 | "malware acl condition: spamd: unable to connect to UNIX socket %s (%s)", | |
189 | spamd_address, strerror(errno) ); | |
f1e894f3 PH |
190 | (void)fclose(mbox_file); |
191 | (void)close(spamd_sock); | |
8523533c TK |
192 | return DEFER; |
193 | } | |
194 | ||
195 | } | |
196 | ||
197 | /* now we are connected to spamd on spamd_sock */ | |
b07e6aa3 | 198 | (void)string_format(spamd_buffer, |
8523533c | 199 | sizeof(spamd_buffer), |
f7b63901 | 200 | "REPORT SPAMC/1.2\r\nUser: %s\r\nContent-length: %ld\r\n\r\n", |
8523533c TK |
201 | user_name, |
202 | mbox_size); | |
203 | ||
204 | /* send our request */ | |
205 | if (send(spamd_sock, spamd_buffer, Ustrlen(spamd_buffer), 0) < 0) { | |
f1e894f3 | 206 | (void)close(spamd_sock); |
8523533c TK |
207 | log_write(0, LOG_MAIN|LOG_PANIC, |
208 | "spam acl condition: spamd send failed: %s", strerror(errno)); | |
f1e894f3 PH |
209 | (void)fclose(mbox_file); |
210 | (void)close(spamd_sock); | |
8523533c TK |
211 | return DEFER; |
212 | }; | |
213 | ||
214 | /* now send the file */ | |
cfe75fc3 PH |
215 | /* spamd sometimes accepts conections but doesn't read data off |
216 | * the connection. We make the file descriptor non-blocking so | |
217 | * that the write will only write sufficient data without blocking | |
218 | * and we poll the desciptor to make sure that we can write without | |
219 | * blocking. Short writes are gracefully handled and if the whole | |
220 | * trasaction takes too long it is aborted. | |
f452e07e | 221 | * Note: poll() is not supported in OSX 10.2. |
cfe75fc3 | 222 | */ |
f452e07e | 223 | #ifndef NO_POLL_H |
cfe75fc3 PH |
224 | pollfd.fd = spamd_sock; |
225 | pollfd.events = POLLOUT; | |
f452e07e | 226 | #endif |
ff790e47 | 227 | (void)fcntl(spamd_sock, F_SETFL, O_NONBLOCK); |
8523533c | 228 | do { |
cfe75fc3 PH |
229 | read = fread(spamd_buffer,1,sizeof(spamd_buffer),mbox_file); |
230 | if (read > 0) { | |
231 | offset = 0; | |
232 | again: | |
f452e07e | 233 | #ifndef NO_POLL_H |
cfe75fc3 PH |
234 | result = poll(&pollfd, 1, 1000); |
235 | if (result == -1 && errno == EINTR) | |
236 | continue; | |
237 | else if (result < 1) { | |
238 | if (result == -1) | |
239 | log_write(0, LOG_MAIN|LOG_PANIC, | |
240 | "spam acl condition: %s on spamd socket", strerror(errno)); | |
241 | else { | |
242 | if (time(NULL) - start < SPAMD_TIMEOUT) | |
243 | goto again; | |
244 | log_write(0, LOG_MAIN|LOG_PANIC, | |
245 | "spam acl condition: timed out writing spamd socket"); | |
246 | } | |
f1e894f3 PH |
247 | (void)close(spamd_sock); |
248 | (void)fclose(mbox_file); | |
8523533c | 249 | return DEFER; |
cfe75fc3 | 250 | } |
f452e07e | 251 | #endif |
cfe75fc3 | 252 | wrote = send(spamd_sock,spamd_buffer + offset,read - offset,0); |
8d7d227d TK |
253 | if (wrote == -1) |
254 | { | |
255 | log_write(0, LOG_MAIN|LOG_PANIC, | |
256 | "spam acl condition: %s on spamd socket", strerror(errno)); | |
f1e894f3 PH |
257 | (void)close(spamd_sock); |
258 | (void)fclose(mbox_file); | |
8d7d227d TK |
259 | return DEFER; |
260 | } | |
cfe75fc3 PH |
261 | if (offset + wrote != read) { |
262 | offset += wrote; | |
263 | goto again; | |
264 | } | |
265 | } | |
266 | } | |
267 | while (!feof(mbox_file) && !ferror(mbox_file)); | |
268 | if (ferror(mbox_file)) { | |
269 | log_write(0, LOG_MAIN|LOG_PANIC, | |
270 | "spam acl condition: error reading spool file: %s", strerror(errno)); | |
f1e894f3 PH |
271 | (void)close(spamd_sock); |
272 | (void)fclose(mbox_file); | |
cfe75fc3 | 273 | return DEFER; |
8523533c | 274 | } |
8523533c | 275 | |
f1e894f3 | 276 | (void)fclose(mbox_file); |
8523533c TK |
277 | |
278 | /* we're done sending, close socket for writing */ | |
279 | shutdown(spamd_sock,SHUT_WR); | |
8e669ac1 | 280 | |
cfe75fc3 PH |
281 | /* read spamd response using what's left of the timeout. |
282 | */ | |
8523533c TK |
283 | memset(spamd_buffer, 0, sizeof(spamd_buffer)); |
284 | offset = 0; | |
285 | while((i = ip_recv(spamd_sock, | |
286 | spamd_buffer + offset, | |
287 | sizeof(spamd_buffer) - offset - 1, | |
cfe75fc3 | 288 | SPAMD_TIMEOUT - time(NULL) + start)) > 0 ) { |
8523533c TK |
289 | offset += i; |
290 | } | |
291 | ||
292 | /* error handling */ | |
293 | if((i <= 0) && (errno != 0)) { | |
294 | log_write(0, LOG_MAIN|LOG_PANIC, | |
295 | "spam acl condition: error reading from spamd socket: %s", strerror(errno)); | |
f1e894f3 | 296 | (void)close(spamd_sock); |
8523533c TK |
297 | return DEFER; |
298 | } | |
299 | ||
300 | /* reading done */ | |
f1e894f3 | 301 | (void)close(spamd_sock); |
8523533c TK |
302 | |
303 | /* dig in the spamd output and put the report in a multiline header, if requested */ | |
304 | if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nContent-length: %*u\r\n\r\n%lf/%lf\r\n%n", | |
305 | spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) { | |
8e669ac1 | 306 | |
8523533c TK |
307 | /* try to fall back to pre-2.50 spamd output */ |
308 | if( sscanf(CS spamd_buffer,"SPAMD/%s 0 EX_OK\r\nSpam: %*s ; %lf / %lf\r\n\r\n%n", | |
309 | spamd_version,&spamd_score,&spamd_threshold,&spamd_report_offset) != 3 ) { | |
310 | log_write(0, LOG_MAIN|LOG_PANIC, | |
311 | "spam acl condition: cannot parse spamd output"); | |
312 | return DEFER; | |
313 | }; | |
314 | }; | |
315 | ||
316 | /* Create report. Since this is a multiline string, | |
317 | we must hack it into shape first */ | |
318 | p = &spamd_buffer[spamd_report_offset]; | |
319 | q = spam_report_buffer; | |
320 | while (*p != '\0') { | |
321 | /* skip \r */ | |
322 | if (*p == '\r') { | |
323 | p++; | |
324 | continue; | |
325 | }; | |
326 | *q = *p; | |
327 | q++; | |
328 | if (*p == '\n') { | |
329 | *q = '\t'; | |
330 | q++; | |
331 | /* eat whitespace */ | |
332 | while( (*p <= ' ') && (*p != '\0') ) { | |
333 | p++; | |
334 | }; | |
335 | p--; | |
336 | }; | |
337 | p++; | |
338 | }; | |
339 | /* NULL-terminate */ | |
340 | *q = '\0'; | |
341 | q--; | |
342 | /* cut off trailing leftovers */ | |
343 | while (*q <= ' ') { | |
344 | *q = '\0'; | |
345 | q--; | |
346 | }; | |
347 | spam_report = spam_report_buffer; | |
348 | ||
349 | /* create spam bar */ | |
350 | spamd_score_char = spamd_score > 0 ? '+' : '-'; | |
351 | j = abs((int)(spamd_score)); | |
352 | i = 0; | |
353 | if( j != 0 ) { | |
354 | while((i < j) && (i <= MAX_SPAM_BAR_CHARS)) | |
355 | spam_bar_buffer[i++] = spamd_score_char; | |
356 | } | |
357 | else{ | |
358 | spam_bar_buffer[0] = '/'; | |
359 | i = 1; | |
360 | } | |
361 | spam_bar_buffer[i] = '\0'; | |
362 | spam_bar = spam_bar_buffer; | |
363 | ||
364 | /* create "float" spam score */ | |
b07e6aa3 | 365 | (void)string_format(spam_score_buffer, sizeof(spam_score_buffer),"%.1f", spamd_score); |
8523533c TK |
366 | spam_score = spam_score_buffer; |
367 | ||
368 | /* create "int" spam score */ | |
369 | j = (int)((spamd_score + 0.001)*10); | |
b07e6aa3 | 370 | (void)string_format(spam_score_int_buffer, sizeof(spam_score_int_buffer), "%d", j); |
8523533c TK |
371 | spam_score_int = spam_score_int_buffer; |
372 | ||
373 | /* compare threshold against score */ | |
374 | if (spamd_score >= spamd_threshold) { | |
375 | /* spam as determined by user's threshold */ | |
376 | spam_rc = OK; | |
377 | } | |
378 | else { | |
379 | /* not spam */ | |
380 | spam_rc = FAIL; | |
381 | }; | |
8e669ac1 | 382 | |
8523533c TK |
383 | /* remember user name and "been here" for it */ |
384 | Ustrcpy(prev_user_name, user_name); | |
385 | spam_ok = 1; | |
8e669ac1 | 386 | |
8523533c TK |
387 | if (override) { |
388 | /* always return OK, no matter what the score */ | |
389 | return OK; | |
390 | } | |
391 | else { | |
392 | return spam_rc; | |
393 | }; | |
394 | } | |
395 | ||
396 | #endif |